User's Manual

LD2103 V2.8 Page 15 of 36
SRT Marine
Instruction Manual
SRT-MTB
©
Class B Marine AIS
LED Indicators
Power
This is a green LED which indicates, when lit, that power has been connected correctly to the transponder, that the transponder
hardware has been configured, that the operating software is present, that the CPU has booted up, the application software is
running.
TX Timeout
This is a yellow LED which indicates when lit that the CSTDMA transmitter is prevented from transmitting. Reasons for this
include the following:
•
The transponder’s internal GPS receiver is not operating or is not yet ready. [1] requires that a class B CSTMA
transponder shall not transmit if its internal position sensor is not operating
•
The transponder was unable to transmit an AIS message due to the channel being already occupied, e.g. by
transmissions from other AIS transponders
Error
This is a red LED which indicates, when lit, one of the following status conditions is possible:
•
Transmitter lockout timer (1 second maximum) has operated
•
GPS is unable to gain lock after 30 minutes
•
VHF antenna VSWR is out of range
•
Power supply is out of range
•
Background noise level is above the threshold level (-77dBm)
SRM Status
This is a blue LED which indicates when lit that the Safety Related Message (SRM) button has been depressed for more than 2
seconds and the pre-set SRM has been sent. If the SRM LED is illuminated it is not possible to send another SRM. An SRM
can be sent once a second. The payload within the message 14 transmission is the text string “MAYDAY” by default.
Antennas
The SRT - MTB unit requires VHF and GPS antennae independent from those in use for other purposes. Please see Appendix
A for details of the antennae required.